2008 Eastern North Pacific Ocean Tropical Cyclones
(includes the Central Pacific Warning Area 140°W - 180°)

Tropical Cyclone Cyclogenesis Date Cyclolysis Date Highest Saffir-Simpson Category Maximum 6-hr Sustained Wind (kt) Maximum 6-hr Wind Gust (kt) Accumulated Cyclone Energy (ACE*) Index (kt2) Landfall Information (date, location and sustained winds)
Alma 5/29/08 5/29/08 TS 55 70 .4625 x 104 5/29/08 - Northen coast of Nicaragua (55 kt)
Boris 6/27/08 7/03/08 Cat 1 65 80 7.2771 x 104
Cristina 6/28/08 6/30/08 TS 45 55 1.2100 x 104
Douglas 7/02/08 7/03/08 TS 35 45 .4900 x 104
Elida 7/12/08 7/19/08 Cat 2 90 110 11.7750 x 104
Fausto 07/16/08 07/22/08 Cat 2 85 105 9.5375 x 104
Genevieve 07/21/08 07/27/08 Cat 1 65 80 5.7125 x 104
Hernan 08/07/08 08/12/08 Cat 3 105 130 11.4875 x 104
Kika 08/07/08 08/10/08 TS 35 45 1.8375 x 104
Iselle 08/13/08 08/15/08 TS 45 55 1.2950 x 104
Julio 08/24/08 08/25/08 TS 45 55 1.1775 x 104
Karina 09/02/08 09/02/08 TS 35 45 .2450 x 104
Lowell 09/06/08 09/10/08 TS 50 60 2.6900 x 104
Marie 10/01/08 10/06/08 Cat 1 70 75 4.5125 x 104
Norbert 10/05/08 10/12/08 Cat 4 115 140 19.1075 x 104 10/11/08 - Southern Baja California, Mexico (90 kt)
Odile 10/09/08 10/12/08 TS 35 N/A 2.7825 x 104
Polo 10/02/08 10/04/08 TS 35 45 .9800 x 104
Haishen 11/16/08 Active TS 40 50 N/A
*The (ACE) Index calculations are based on preliminary data.

*The Accumulated Cyclone Energy (ACE) Index is calculated by summing the squares of the estimated 6-hourly maximum sustained wind speed in knots (Vmax2) for all periods in which the tropical cyclone is a tropical storm or greater intensity (sustained winds of 34 kt or greater). Note that the official NOAA definition of the ACE Index does not include those periods when the system is characterized as sub-tropical. However, we are including this information to allow for comparison between individual cyclones across all basins, many of which contain records which inadequately distinguish between tropical and subtropical cyclones. For a complete description of the ACE Index see Bell and Chelliah (2006), Journal of Climate (19) 590-612.


The Saffir-Simpson Scale for Tropical Cyclones

Category Miles Per Hour (mph) Knots (kt) Kilometers Per Hour (km hr-1)
Tropical Storm (TS)
39-73 34-63 63-118
Cat 1
74-95 64-82 119-153
Cat 2
96-110 83-95 154-177
Cat 3
111-130 96-113 178-209
Cat 4
131-155 114-135 210-249
Cat 5
156 or greater 136 or greater 250 or greater